Control unit



FIG. 1 is a perspective view of a control unit showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof with the opposite side being a mirror image thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The areas shown in broken lines do not form any part of the claimed design. 

The ornamental design for a control unit, as shown and described. 